VoIP: small refacts and cleaning

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/EventInsertLiveObserver.kt

@@ -71,7 +71,6 @@ internal class EventInsertLiveObserver @Inject constructor(@SessionDatabase real
                         return@forEach
                     }
                     val domainEvent = event.asDomain()
-//                    decryptIfNeeded(domainEvent)
                     processors.filter {
                         it.shouldProcess(eventId, domainEvent.getClearType(), eventInsert.insertType)
                     }.forEach {
@@ -83,6 +82,7 @@ internal class EventInsertLiveObserver @Inject constructor(@SessionDatabase real
                         .findAll()
                         .deleteAllFromRealm()
             }
+            processors.forEach { it.onPostProcess() }
         }
     }
 

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/EventInsertLiveProcessor.kt

@@ -25,4 +25,12 @@ internal interface EventInsertLiveProcessor {
     fun shouldProcess(eventId: String, eventType: String, insertType: EventInsertType): Boolean
 
     suspend fun process(realm: Realm, event: Event)
+
+    /**
+     * Called after transaction.
+     * Maybe you prefer to process the events outside of the realm transaction.
+     */
+    suspend fun onPostProcess() {
+        // Noop by default
+    }
 }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/call/CallEventProcessor.kt

@@ -16,19 +16,16 @@
 
 package org.matrix.android.sdk.internal.session.call
 
+import io.realm.Realm
 import org.matrix.android.sdk.api.session.events.model.Event
 import org.matrix.android.sdk.api.session.events.model.EventType
 import org.matrix.android.sdk.internal.database.model.EventInsertType
-import org.matrix.android.sdk.internal.di.UserId
 import org.matrix.android.sdk.internal.session.EventInsertLiveProcessor
-import io.realm.Realm
 import timber.log.Timber
 import javax.inject.Inject
 
-internal class CallEventProcessor @Inject constructor(
+internal class CallEventProcessor @Inject constructor(private val callSignalingHandler: CallSignalingHandler)
-        @UserId private val userId: String,
+    : EventInsertLiveProcessor {
-        private val callService: DefaultCallSignalingService
-) : EventInsertLiveProcessor {
 
     private val allowedTypes = listOf(
             EventType.CALL_ANSWER,
@@ -41,6 +38,8 @@ internal class CallEventProcessor @Inject constructor(
             EventType.ENCRYPTED
     )
 
+    private val eventsToPostProcess = mutableListOf<Event>()
+
     override fun shouldProcess(eventId: String, eventType: String, insertType: EventInsertType): Boolean {
         if (insertType != EventInsertType.INCREMENTAL_SYNC) {
             return false
@@ -49,10 +48,17 @@ internal class CallEventProcessor @Inject constructor(
     }
 
     override suspend fun process(realm: Realm, event: Event) {
-        update(realm, event)
+        eventsToPostProcess.add(event)
     }
 
-    private fun update(realm: Realm, event: Event) {
+    override suspend fun onPostProcess() {
+        eventsToPostProcess.forEach {
+            dispatchToCallSignalingHandlerIfNeeded(it)
+        }
+        eventsToPostProcess.clear()
+    }
+
+    private fun dispatchToCallSignalingHandlerIfNeeded(event: Event) {
         val now = System.currentTimeMillis()
         // TODO might check if an invite is not closed (hangup/answsered) in the same event batch?
         event.roomId ?: return Unit.also {
@@ -63,10 +69,6 @@ internal class CallEventProcessor @Inject constructor(
             // To old to ring?
             return
         }
-        event.ageLocalTs
+        callSignalingHandler.onCallEvent(event)
-        if (EventType.isCallEvent(event.getClearType())) {
-            callService.onCallEvent(event)
-        }
-        Timber.v("$realm : $userId")
     }
 }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/call/CallSignalingHandler.kt

@@ -0,0 +1,206 @@
+/*
+ * Copyright (c) 2020 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.internal.session.call
+
+import org.matrix.android.sdk.api.session.call.CallListener
+import org.matrix.android.sdk.api.session.call.CallState
+import org.matrix.android.sdk.api.session.call.MxCall
+import org.matrix.android.sdk.api.session.events.model.Event
+import org.matrix.android.sdk.api.session.events.model.EventType
+import org.matrix.android.sdk.api.session.events.model.toModel
+import org.matrix.android.sdk.api.session.room.model.call.CallAnswerContent
+import org.matrix.android.sdk.api.session.room.model.call.CallCandidatesContent
+import org.matrix.android.sdk.api.session.room.model.call.CallHangupContent
+import org.matrix.android.sdk.api.session.room.model.call.CallInviteContent
+import org.matrix.android.sdk.api.session.room.model.call.CallNegotiateContent
+import org.matrix.android.sdk.api.session.room.model.call.CallRejectContent
+import org.matrix.android.sdk.api.session.room.model.call.CallSelectAnswerContent
+import org.matrix.android.sdk.api.session.room.model.call.CallSignallingContent
+import org.matrix.android.sdk.api.util.Optional
+import org.matrix.android.sdk.internal.di.UserId
+import org.matrix.android.sdk.internal.session.SessionScope
+import timber.log.Timber
+import java.math.BigDecimal
+import javax.inject.Inject
+
+@SessionScope
+internal class CallSignalingHandler @Inject constructor(private val activeCallHandler: ActiveCallHandler,
+                                                        private val mxCallFactory: MxCallFactory,
+                                                        @UserId private val userId: String) {
+
+    private val callListeners = mutableSetOf<CallListener>()
+    private val callListenersDispatcher = CallListenersDispatcher(callListeners)
+
+    fun addCallListener(listener: CallListener) {
+        callListeners.add(listener)
+    }
+
+    fun removeCallListener(listener: CallListener) {
+        callListeners.remove(listener)
+    }
+
+    fun onCallEvent(event: Event) {
+        when (event.getClearType()) {
+            EventType.CALL_ANSWER -> {
+                handleCallAnswerEvent(event)
+            }
+            EventType.CALL_INVITE -> {
+                handleCallInviteEvent(event)
+            }
+            EventType.CALL_HANGUP -> {
+                handleCallHangupEvent(event)
+            }
+            EventType.CALL_REJECT -> {
+                handleCallRejectEvent(event)
+            }
+            EventType.CALL_CANDIDATES -> {
+                handleCallCandidatesEvent(event)
+            }
+            EventType.CALL_SELECT_ANSWER -> {
+                handleCallSelectAnswerEvent(event)
+            }
+            EventType.CALL_NEGOTIATE -> {
+                handleCallNegotiateEvent(event)
+            }
+        }
+    }
+
+    private fun handleCallNegotiateEvent(event: Event) {
+        val content = event.getClearContent().toModel<CallNegotiateContent>() ?: return
+        val call = content.getCall() ?: return
+        if (call.ourPartyId == content.partyId) {
+            // Ignore remote echo
+            return
+        }
+        callListenersDispatcher.onCallNegotiateReceived(content)
+    }
+
+    private fun handleCallSelectAnswerEvent(event: Event) {
+        val content = event.getClearContent().toModel<CallSelectAnswerContent>() ?: return
+        val call = content.getCall() ?: return
+        if (call.ourPartyId == content.partyId) {
+            // Ignore remote echo
+            return
+        }
+        if (call.isOutgoing) {
+            Timber.v("Got selectAnswer for an outbound call: ignoring")
+            return
+        }
+        val selectedPartyId = content.selectedPartyId
+        if (selectedPartyId == null) {
+            Timber.w("Got nonsensical select_answer with null selected_party_id: ignoring")
+            return
+        }
+        callListenersDispatcher.onCallSelectAnswerReceived(content)
+    }
+
+    private fun handleCallCandidatesEvent(event: Event) {
+        val content = event.getClearContent().toModel<CallCandidatesContent>() ?: return
+        val call = content.getCall() ?: return
+        if (call.ourPartyId == content.partyId) {
+            // Ignore remote echo
+            return
+        }
+        if (call.opponentPartyId != null && !call.partyIdsMatches(content)) {
+            Timber.v("Ignoring candidates from party ID ${content.partyId} we have chosen party ID ${call.opponentPartyId}")
+            return
+        }
+        callListenersDispatcher.onCallIceCandidateReceived(call, content)
+    }
+
+    private fun handleCallRejectEvent(event: Event) {
+        val content = event.getClearContent().toModel<CallRejectContent>() ?: return
+        val call = content.getCall() ?: return
+        activeCallHandler.removeCall(content.callId)
+        // No need to check party_id for reject because if we'd received either
+        // an answer or reject, we wouldn't be in state InviteSent
+        if (call.state != CallState.Dialing) {
+            return
+        }
+        callListenersDispatcher.onCallRejectReceived(content)
+    }
+
+    private fun handleCallHangupEvent(event: Event) {
+        val content = event.getClearContent().toModel<CallHangupContent>() ?: return
+        val call = content.getCall() ?: return
+        // party ID must match (our chosen partner hanging up the call) or be undefined (we haven't chosen
+        // a partner yet but we're treating the hangup as a reject as per VoIP v0)
+        if (call.opponentPartyId != null && !call.partyIdsMatches(content)) {
+            Timber.v("Ignoring hangup from party ID ${content.partyId} we have chosen party ID ${call.opponentPartyId}")
+            return
+        }
+        if (call.state != CallState.Terminated) {
+            activeCallHandler.removeCall(content.callId)
+            callListenersDispatcher.onCallHangupReceived(content)
+        }
+    }
+
+    private fun handleCallInviteEvent(event: Event) {
+        if (event.senderId == userId) {
+            // ignore invites you send
+            return
+        }
+        if (event.roomId == null || event.senderId == null) {
+            return
+        }
+        val content = event.getClearContent().toModel<CallInviteContent>() ?: return
+        val incomingCall = mxCallFactory.createIncomingCall(
+                roomId = event.roomId,
+                senderId = event.senderId,
+                content = content
+        ) ?: return
+        activeCallHandler.addCall(incomingCall)
+        callListenersDispatcher.onCallInviteReceived(incomingCall, content)
+    }
+
+    private fun handleCallAnswerEvent(event: Event) {
+        val content = event.getClearContent().toModel<CallAnswerContent>() ?: return
+        val call = content.getCall() ?: return
+        if (call.ourPartyId == content.partyId) {
+            // Ignore remote echo
+            return
+        }
+        if (event.senderId == userId) {
+            // discard current call, it's answered by another of my session
+            callListenersDispatcher.onCallManagedByOtherSession(content.callId)
+        } else {
+            if (call.opponentPartyId != null) {
+                Timber.v("Ignoring answer from party ID ${content.partyId} we already have an answer from ${call.opponentPartyId}")
+                return
+            }
+            call.apply {
+                opponentPartyId = Optional.from(content.partyId)
+                opponentVersion = content.version?.let { BigDecimal(it).intValueExact() } ?: MxCall.VOIP_PROTO_VERSION
+            }
+            callListenersDispatcher.onCallAnswerReceived(content)
+        }
+    }
+
+    private fun MxCall.partyIdsMatches(contentSignallingContent: CallSignallingContent): Boolean {
+        return opponentPartyId?.getOrNull() == contentSignallingContent.partyId
+    }
+
+    private fun CallSignallingContent.getCall(): MxCall? {
+        val currentCall = callId?.let {
+            activeCallHandler.getCallWithId(it)
+        }
+        if (currentCall == null) {
+            Timber.v("Call for content: $this is null")
+        }
+        return currentCall
+    }
+}

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/call/DefaultCallSignalingService.kt

@@ -16,116 +16,46 @@
 
 package org.matrix.android.sdk.internal.session.call
 
-import android.os.SystemClock
+import kotlinx.coroutines.Dispatchers
 import org.matrix.android.sdk.api.MatrixCallback
 import org.matrix.android.sdk.api.session.call.CallListener
 import org.matrix.android.sdk.api.session.call.CallSignalingService
-import org.matrix.android.sdk.api.session.call.CallState
 import org.matrix.android.sdk.api.session.call.MxCall
 import org.matrix.android.sdk.api.session.call.TurnServerResponse
-import org.matrix.android.sdk.api.session.events.model.Event
-import org.matrix.android.sdk.api.session.events.model.EventType
-import org.matrix.android.sdk.api.session.events.model.toModel
-import org.matrix.android.sdk.api.session.room.model.call.CallAnswerContent
-import org.matrix.android.sdk.api.session.room.model.call.CallCandidatesContent
-import org.matrix.android.sdk.api.session.room.model.call.CallHangupContent
-import org.matrix.android.sdk.api.session.room.model.call.CallInviteContent
-import org.matrix.android.sdk.api.session.room.model.call.CallNegotiateContent
-import org.matrix.android.sdk.api.session.room.model.call.CallRejectContent
-import org.matrix.android.sdk.api.session.room.model.call.CallSelectAnswerContent
-import org.matrix.android.sdk.api.session.room.model.call.CallSignallingContent
 import org.matrix.android.sdk.api.util.Cancelable
-import org.matrix.android.sdk.api.util.NoOpCancellable
-import org.matrix.android.sdk.api.util.Optional
-import org.matrix.android.sdk.internal.di.DeviceId
-import org.matrix.android.sdk.internal.di.UserId
 import org.matrix.android.sdk.internal.session.SessionScope
-import org.matrix.android.sdk.internal.session.call.model.MxCallImpl
-import org.matrix.android.sdk.internal.session.room.send.LocalEchoEventFactory
-import org.matrix.android.sdk.internal.session.room.send.queue.EventSenderProcessor
 import org.matrix.android.sdk.internal.task.TaskExecutor
-import org.matrix.android.sdk.internal.task.configureWith
+import org.matrix.android.sdk.internal.task.launchToCallback
 import timber.log.Timber
-import java.math.BigDecimal
-import java.util.UUID
 import javax.inject.Inject
 
 @SessionScope
 internal class DefaultCallSignalingService @Inject constructor(
-        @UserId
+        private val callSignalingHandler: CallSignalingHandler,
-        private val userId: String,
+        private val mxCallFactory: MxCallFactory,
-        @DeviceId
-        private val deviceId: String?,
         private val activeCallHandler: ActiveCallHandler,
-        private val localEchoEventFactory: LocalEchoEventFactory,
-        private val eventSenderProcessor: EventSenderProcessor,
         private val taskExecutor: TaskExecutor,
-        private val turnServerTask: GetTurnServerTask
+        private val turnServerDataSource: TurnServerDataSource
 ) : CallSignalingService {
 
-    private val callListeners = mutableSetOf<CallListener>()
-    private val callListenersDispatcher = CallListenersDispatcher(callListeners)
-
-    private val cachedTurnServerResponse = object {
-        // Keep one minute safe to avoid considering the data is valid and then actually it is not when effectively using it.
-        private val MIN_TTL = 60
-
-        private val now = { SystemClock.elapsedRealtime() / 1000 }
-
-        private var expiresAt: Long = 0
-
-        var data: TurnServerResponse? = null
-            get() = if (expiresAt > now()) field else null
-            set(value) {
-                expiresAt = now() + (value?.ttl ?: 0) - MIN_TTL
-                field = value
-            }
-    }
-
     override fun getTurnServer(callback: MatrixCallback<TurnServerResponse>): Cancelable {
-        if (cachedTurnServerResponse.data != null) {
+        return taskExecutor.executorScope.launchToCallback(Dispatchers.Default, callback) {
-            cachedTurnServerResponse.data?.let { callback.onSuccess(it) }
+            turnServerDataSource.getTurnServer()
-            return NoOpCancellable
         }
-        return turnServerTask
-                .configureWith(GetTurnServerTask.Params) {
-                    this.callback = object : MatrixCallback<TurnServerResponse> {
-                        override fun onSuccess(data: TurnServerResponse) {
-                            cachedTurnServerResponse.data = data
-                            callback.onSuccess(data)
-                        }
-
-                        override fun onFailure(failure: Throwable) {
-                            callback.onFailure(failure)
-                        }
-                    }
-                }
-                .executeBy(taskExecutor)
     }
 
     override fun createOutgoingCall(roomId: String, otherUserId: String, isVideoCall: Boolean): MxCall {
-        val call = MxCallImpl(
+        return mxCallFactory.createOutgoingCall(roomId, otherUserId, isVideoCall).also {
-                callId = UUID.randomUUID().toString(),
+            activeCallHandler.addCall(it)
-                isOutgoing = true,
-                roomId = roomId,
-                userId = userId,
-                ourPartyId = deviceId ?: "",
-                opponentUserId = otherUserId,
-                isVideoCall = isVideoCall,
-                localEchoEventFactory = localEchoEventFactory,
-                eventSenderProcessor = eventSenderProcessor
-        )
-        activeCallHandler.addCall(call).also {
-            return call
         }
     }
 
     override fun addCallListener(listener: CallListener) {
-        callListeners.add(listener)
+        callSignalingHandler.addCallListener(listener)
     }
 
     override fun removeCallListener(listener: CallListener) {
-        callListeners.remove(listener)
+        callSignalingHandler.removeCallListener(listener)
     }
 
     override fun getCallWithId(callId: String): MxCall? {
@@ -137,154 +67,6 @@ internal class DefaultCallSignalingService @Inject constructor(
         return activeCallHandler.getActiveCallsLiveData().value?.isNotEmpty() == true
     }
 
-    internal fun onCallEvent(event: Event) {
-        when (event.getClearType()) {
-            EventType.CALL_ANSWER -> {
-                handleCallAnswerEvent(event)
-            }
-            EventType.CALL_INVITE -> {
-                handleCallInviteEvent(event)
-            }
-            EventType.CALL_HANGUP -> {
-                handleCallHangupEvent(event)
-            }
-            EventType.CALL_REJECT -> {
-                handleCallRejectEvent(event)
-            }
-            EventType.CALL_CANDIDATES -> {
-                handleCallCandidatesEvent(event)
-            }
-            EventType.CALL_SELECT_ANSWER -> {
-                handleCallSelectAnswerEvent(event)
-            }
-            EventType.CALL_NEGOTIATE -> {
-                handleCallNegotiateEvent(event)
-            }
-        }
-    }
-
-    private fun handleCallNegotiateEvent(event: Event) {
-        val content = event.getClearContent().toModel<CallNegotiateContent>() ?: return
-        val call = content.getCall() ?: return
-        if (call.ourPartyId == content.partyId) {
-            // Ignore remote echo
-            return
-        }
-        callListenersDispatcher.onCallNegotiateReceived(content)
-    }
-
-    private fun handleCallSelectAnswerEvent(event: Event) {
-        val content = event.getClearContent().toModel<CallSelectAnswerContent>() ?: return
-        val call = content.getCall() ?: return
-        if (call.ourPartyId == content.partyId) {
-            // Ignore remote echo
-            return
-        }
-        if (call.isOutgoing) {
-            Timber.v("Got selectAnswer for an outbound call: ignoring")
-            return
-        }
-        val selectedPartyId = content.selectedPartyId
-        if (selectedPartyId == null) {
-            Timber.w("Got nonsensical select_answer with null selected_party_id: ignoring")
-            return
-        }
-        callListenersDispatcher.onCallSelectAnswerReceived(content)
-    }
-
-    private fun handleCallCandidatesEvent(event: Event) {
-        val content = event.getClearContent().toModel<CallCandidatesContent>() ?: return
-        val call = content.getCall() ?: return
-        if (call.ourPartyId == content.partyId) {
-            // Ignore remote echo
-            return
-        }
-        if (call.opponentPartyId != Optional.from(content.partyId)) {
-            Timber.v("Ignoring candidates from party ID ${content.partyId} we have chosen party ID ${call.opponentPartyId}")
-            return
-        }
-        callListenersDispatcher.onCallIceCandidateReceived(call, content)
-    }
-
-    private fun handleCallRejectEvent(event: Event) {
-        val content = event.getClearContent().toModel<CallRejectContent>() ?: return
-        val call = content.getCall() ?: return
-        activeCallHandler.removeCall(content.callId)
-        // No need to check party_id for reject because if we'd received either
-        // an answer or reject, we wouldn't be in state InviteSent
-        if (call.state != CallState.Dialing) {
-            return
-        }
-        callListenersDispatcher.onCallRejectReceived(content)
-    }
-
-    private fun handleCallHangupEvent(event: Event) {
-        val content = event.getClearContent().toModel<CallHangupContent>() ?: return
-        val call = content.getCall() ?: return
-        if (call.state != CallState.Terminated) {
-            // Need to check for party_id?
-            activeCallHandler.removeCall(content.callId)
-            callListenersDispatcher.onCallHangupReceived(content)
-        }
-    }
-
-    private fun handleCallInviteEvent(event: Event) {
-        if (event.senderId == userId) {
-            // ignore invites you send
-            return
-        }
-        val content = event.getClearContent().toModel<CallInviteContent>() ?: return
-        val incomingCall = MxCallImpl(
-                callId = content.callId ?: return,
-                isOutgoing = false,
-                roomId = event.roomId ?: return,
-                userId = userId,
-                ourPartyId = deviceId ?: "",
-                opponentUserId = event.senderId ?: return,
-                isVideoCall = content.isVideo(),
-                localEchoEventFactory = localEchoEventFactory,
-                eventSenderProcessor = eventSenderProcessor
-        ).apply {
-            opponentPartyId = Optional.from(content.partyId)
-            opponentVersion = content.version?.let { BigDecimal(it).intValueExact() } ?: MxCall.VOIP_PROTO_VERSION
-        }
-        activeCallHandler.addCall(incomingCall)
-        callListenersDispatcher.onCallInviteReceived(incomingCall, content)
-    }
-
-    private fun handleCallAnswerEvent(event: Event) {
-        val content = event.getClearContent().toModel<CallAnswerContent>() ?: return
-        val call = content.getCall() ?: return
-        if (call.ourPartyId == content.partyId) {
-            // Ignore remote echo
-            return
-        }
-        if (event.senderId == userId) {
-            // discard current call, it's answered by another of my session
-            callListenersDispatcher.onCallManagedByOtherSession(content.callId)
-        } else {
-            if (call.opponentPartyId != null) {
-                Timber.v("Ignoring answer from party ID ${content.partyId} we already have an answer from ${call.opponentPartyId}")
-                return
-            }
-            call.apply {
-                opponentPartyId = Optional.from(content.partyId)
-                opponentVersion = content.version?.let { BigDecimal(it).intValueExact() } ?: MxCall.VOIP_PROTO_VERSION
-            }
-            callListenersDispatcher.onCallAnswerReceived(content)
-        }
-    }
-
-    private fun CallSignallingContent.getCall(): MxCall? {
-        val currentCall = callId?.let {
-            activeCallHandler.getCallWithId(it)
-        }
-        if (currentCall == null) {
-            Timber.v("Call for content: $this is null")
-        }
-        return currentCall
-    }
-
     companion object {
         const val CALL_TIMEOUT_MS = 120_000
     }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/call/MxCallFactory.kt

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2020 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.internal.session.call
+
+import org.matrix.android.sdk.api.session.call.MxCall
+import org.matrix.android.sdk.api.session.room.model.call.CallInviteContent
+import org.matrix.android.sdk.api.util.Optional
+import org.matrix.android.sdk.internal.di.DeviceId
+import org.matrix.android.sdk.internal.di.UserId
+import org.matrix.android.sdk.internal.session.call.model.MxCallImpl
+import org.matrix.android.sdk.internal.session.room.send.LocalEchoEventFactory
+import org.matrix.android.sdk.internal.session.room.send.queue.EventSenderProcessor
+import java.math.BigDecimal
+import java.util.UUID
+import javax.inject.Inject
+
+internal class MxCallFactory @Inject constructor(
+        @DeviceId private val deviceId: String?,
+        private val localEchoEventFactory: LocalEchoEventFactory,
+        private val eventSenderProcessor: EventSenderProcessor,
+        @UserId private val userId: String
+) {
+
+    fun createIncomingCall(roomId: String, senderId: String, content: CallInviteContent): MxCall? {
+        if (content.callId == null) return null
+        return MxCallImpl(
+                callId = content.callId,
+                isOutgoing = false,
+                roomId = roomId,
+                userId = userId,
+                ourPartyId = deviceId ?: "",
+                opponentUserId = senderId,
+                isVideoCall = content.isVideo(),
+                localEchoEventFactory = localEchoEventFactory,
+                eventSenderProcessor = eventSenderProcessor
+        ).apply {
+            opponentPartyId = Optional.from(content.partyId)
+            opponentVersion = content.version?.let { BigDecimal(it).intValueExact() } ?: MxCall.VOIP_PROTO_VERSION
+        }
+    }
+
+    fun createOutgoingCall(roomId: String, otherUserId: String, isVideoCall: Boolean): MxCall {
+        return MxCallImpl(
+                callId = UUID.randomUUID().toString(),
+                isOutgoing = true,
+                roomId = roomId,
+                userId = userId,
+                ourPartyId = deviceId ?: "",
+                opponentUserId = otherUserId,
+                isVideoCall = isVideoCall,
+                localEchoEventFactory = localEchoEventFactory,
+                eventSenderProcessor = eventSenderProcessor
+        )
+    }
+}

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/call/TurnServerDataSource.kt

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2020 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.internal.session.call
+
+import android.os.SystemClock
+import org.matrix.android.sdk.api.session.call.TurnServerResponse
+import javax.inject.Inject
+
+internal class TurnServerDataSource @Inject constructor(private val turnServerTask: GetTurnServerTask) {
+
+    private val cachedTurnServerResponse = object {
+        // Keep one minute safe to avoid considering the data is valid and then actually it is not when effectively using it.
+        private val MIN_TTL = 60
+
+        private val now = { SystemClock.elapsedRealtime() / 1000 }
+
+        private var expiresAt: Long = 0
+
+        var data: TurnServerResponse? = null
+            get() = if (expiresAt > now()) field else null
+            set(value) {
+                expiresAt = now() + (value?.ttl ?: 0) - MIN_TTL
+                field = value
+            }
+    }
+
+    suspend fun getTurnServer(): TurnServerResponse {
+        return cachedTurnServerResponse.data ?: turnServerTask.execute(GetTurnServerTask.Params).also {
+            cachedTurnServerResponse.data = it
+        }
+    }
+}